Edge finishing for dampening roller covers of lithographic plates



July 1, 1958 P. N. GUGLIELMO ETAL 2,840,888

EDGE FINISHING FOR DAMPENING ROLLER COVERS OF LITHOGRAPHIC PLATES FiledJuly 15, 1956 INYZ'NTDRS. Paul M aylzbna fiv'bert @6056 ag; W

United States Patent ice EDGE FINISHING FOR DAMPENING ROLLER COVERS OFLITHOGRAPHIC PLATES Paul N. Guglielmo and Herbert Jacobs, Brooklyn, N.Y.

Application July 13, 1956, Serial No. 597,707

1 Claim. (Cl. 29-119) This invention relates to the art of roller coversand particularly concerns a cover for a roller such as may be used tomoisten lithographic plates in a lithographic printing process.

Roller covers of the type used in lithographic printing have been madeof densely compacted felt, moleskin, flannel, and the like. These coversare formed as sleevelike structures with a longitudinal seam. The coveris mounted on a suitable roller in a stretched condition so that asmooth and unwrinkled surface is provided for moistening purposes.

Such roller covers tend to stretch and disintegrate unless the stitchingis at least as strong as the material of the cover. The presentinvention is directed at providing a finishing means for thelongitudinally stitched seam of a roller cover of the type described.

It has also been found necessary to provide some means of binding theraw or cut annular edges of the cylindrical cover whether made of wovenor felted material. In the present invention there is provided aflexible means for binding these raw edges without increasing the bulkof the roller at the ends thereof.

For further comprehension of the invention, and of the objects andadvantages thereof, reference will be had to the following descriptionand accompanying drawings, and to the appended claim in which thevarious novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a perspective view of a roller cover embodying the invention.The cover is mounted on a suitable cylindrical roller.

Fig. 2 is a perspective view of a portion of the roller cover of Fig. 1with the roller core removed to show interior structural details of thecover.

Fig. 3 is a cross-sectional view taken on lines 3-3 of Fig. 2.

Figs. 4, 5, 6 and 7 are perspective views of a portion of the covershowing various successive stages of fabrication thereof, the coverportion being inside out.

A rigid cylindrical roller 10 is shown in Fig. 1. This roller has shaftends 11, 12 extending axially therefrom for mounting the roller in alithographic printing press. On the roller core is a cover 14 snugly andtightly mounted. This cover is a cylindrical sleeve of felt, flannel,moleskin, or other absorbent material. 7 The cover is made of arectangular piece of moisture-absorbent material and has a machine sewnlongitudinal seam 15. The abutting edges of the seam are secured bystitches 16. Opposite ends of the row of stitches are terminated in bartacks 17, 18 disposed perpendicular to the seam 15. The stitching of thetacks is quite dense, and effectively prevents the ends of the seam frombecoming loose since the strength of the tacks normally exceeds thestrength of the material of the cover. The outer side 0 of the cover isshown in Fig. 1.

The unbound or raw annular end edges of the cover are provided with weltcords 20, 21 round in cross-section 2,840,888 Patented July 1, 1958encircling the respective end edges of the cover. The cords haveoverlapping ends which may be knotted if desired. The cord ends overlapat points E, E which are adjacent the bar tacks 17, 18, respectively.The cords are secured to the roller cover by lock stitches, whipstitches or overcast stitches 23.

In Figs. 2 and 3 are shown details of the internal structure of thecover or sleeve 14. Bar tack 17 is shown disposed perpendicular to seam15 and overlies the end of the lock stitches 16. The welt cord 20 isembedded in the raw end or edge of the cover and the ends of the cordare crossed, knotted or overlapped at E. The inner and outer sides I and0, respectively, are shown in Figs. 2 and 3.

In Figs. 4-7 are shown steps in the finishing procedure of the cover.Side I is initially outside and side 0 is inside the cover. Side edges Aand A of the felt sheet are shown disposed in a coplanar fashion so thatthe lock stitches 16 may be sewn through a flat double thickness of thefelt. The raw or cut end edges 25 of the felt are exposed as shown inFigs. 4 and 5. The ends 26 of the thread 16 are knotted and then the bartack 17 is sewn. A similar knotting and bar tacking is shown at theother end of the cover, in Fig. 1, which is not shown in Figs. 47 Afterthe bar tacks are made the thread ends 26 are cut off. Welt cords 20, 21are then applied to the raw edges 25 of the cover and whip or lockstitches 23 are made. The ends 25' of cord 20 are shown knotted in Fig.6. The ends 27 of thread 23 are knotted and the excess thread is cutoff. Then ends 25' of cords 20, 21 are cut off just beyond the knots onoverlapped ends of the cords at points E, E which are adjacent the bartacks 17, 18. In Fig. 7 the sewing of seam 15 and binding of cord 20 areshown completed and the sleeve or cover 14 is ready to be turned insideout. Cords 20, 21 are embedded in the raw ends 25 of the cover.

While we have illustrated and described the preferred embodiment of ourinvention, it is to be understood that we do not limit ourselves to theprecise construction herein disclosed and that various changes andmodifications may be made within the scope of the invention as definedin the appended claim.

Having thus described our invention, what We claim as new, and desire tosecure by United States Letter Patent is:

A lithographic moistening roller, comprising a rigid cylindrical memberhaving axially extending shaft ends, a cover disposed on said member,said cover being a cylindrical sleeve, said sleeve being smooth, tautand wrinklefree and being formed from a moisture-absorbent rectangularsheet, opposite side edges of said sheet being sewn together to form alongitudinal seam in the sleeve, said seam extending substantially thefull length of said sleeve, a pair of bar tacks, said tacks respectivelyterminating opposite ends of said seam, said tacks extending completelythrough the sleeve from one side to the other, and a pair of Welt cords,said cords respectively being juxtaposed against opposite annular rawend edges of said sleeve, said cords being secured to said annular endedges by continuous lines of stitching.

References Cited in the file of this patent UNITED STATES PATENTSNeedlecraft Encyclopedia, published by Good Housekeeping Magazine, 1947,page 73 relied upon.

